Singleton design pattern makes sure that there should be only one instance of the specific class at a given time. Please refer to the example code for C# implementation.
Example
// Singleton class Customer
public class Customer
{
private static readonly Lazy<Customer> _lazy = new Lazy<Customer>(() => new Customer());
private Customer() { }
public static Customer Instance
{
get
{
return _lazy.Value;
}
}
}
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